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Old Jul 28th 2016, 04:47 PM   #1
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new sitta spockets 520

Just got my new ergal sitta kit, its really well made and wow so light. Kit came with front, rear and DID chain. I cant wait to install this this weekend. I never liked the extra bolts and I have no need for quick change set up.
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Old Jul 28th 2016, 04:53 PM   #2
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Beautiful piece! Where'd you get it?


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Old Jul 28th 2016, 04:59 PM   #3
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Desmo-Racing France , ducati parts and remaping , MV Agusta , Cnc Racing , Ducabike , Metaltech , Spider


I believe used in wsb and moto gp. It is ridiculously light.
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Old Jul 28th 2016, 06:48 PM   #4
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I use these exclusively. Probably the best aluminum sprocket there is. Regardless, guys listen up. These are race parts. They are pulled and inspected and probably tossed after ever race on bikes making 200+hp. These are not "set and forget". The very nature of the Ducati drive destroys aluminum rear sprockets. The flange has a precision fit against the spacer that butts aginst the rear bearing. This assembly sandwiches the sprocket between the flange and the washer. The very nature of the cush drive causes the sprocket to slightly rotate clockwise and counterclockwise as it is loaded and unloaded. This will cause the steel spacer to wear a groove in the back of the sprocket in this case or the carrier if your using a two piece design (CNC, NCR etc). This is not a problem on the stock assembly as the sprocket is steel. You can significantly reduce this by polishing the spacer with 600g on the sprocket side and using an anti seize lubricant there. This would not be a problem if the wear occured between the spacer and the bearing race as the spacer is cheap but the friction dynamics seems to favor the sprocket side. I buy these off ebay for $125.00. I just finished machining the back of a Sitta 41T 520 to use a needle bearing thrust washer. This should eliminate the issue all together. I must add that there are circumstances that will make this more or less pronounced. I use the CNC Ti flange so the sprocket really has no choice but to be the sacrificial "weak link". Not sure what happens with the alloy flanges. Regardless this does not change the fact that you need to watch these things for wear and apply a bit more vigilance.
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Old Jul 28th 2016, 08:04 PM   #5
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The fact that the box say "competition use only" kind of gives it away.
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Old Jul 28th 2016, 08:29 PM   #6
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Yep and thats what a good portion of the packaging says on a lot of parts guys throw on their cars and bikes. Nothing wrong with it as long as you can support it. I was exposed to this very early on racing bicycles. Everyone wanted all the light weight stuff because thats what the guys in the magazines had. They just didn't know that the guys in the magazines threw out stuff after 200 miles.
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Old Jul 28th 2016, 08:52 PM   #7
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Sitta on my 1299

41T 520. CNC Ti carrier. AEM Ti drive pins
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Old Jul 29th 2016, 01:25 PM   #8
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So you are saying a renthal or afam hardened aluminum sprocket would last longer. Everything we put on our bikes is race only.
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Old Jul 29th 2016, 02:38 PM   #9
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Super Sprockets makes a nice allow/steel hybrid.. I just installed one..

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Old Jul 29th 2016, 05:56 PM   #10
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I cant speak for all of the brands and nuances associated with different set ups only my own experiences working on different set ups. The stock setup is 530 with an integrated steel carrier and sprocket. All of the engineering data related to longevity and service intervals were based on this system. You start changing pieces in an engineered system and you should probably take the potential variables into consideration. My original post said "aluminum" sprocket. While there are for sure different alloy compositions, the fact that this material is going to wear differently than steel and is less tolerable of abrasive contamination should be considered.This seems at least on the setups that i have worked with (CNC, Ducati Corse, AEM, NCR, Sitta) to vary depending on how you mix and match components. They make a simple tooth gauge in 530,520 etc. When the sprocket is out of spec, I toss it. If there is any play in the carrier, it get tossed as that is a pre load fit. If i replace the carrier or in my case the sprocket as it is integrated, I always use a new spacer. Pretty simple.Other than a "bling" factor, I see no use in a separate carrier and sprocket for this setup. It is far quicker to just pull the flange nut and swap the sprocket than to change out six bolts. I have never seen a SBK team use anything but the integrated setup and I have never seen a separate alloy carrier that was not worn on the back side so its actually less expensive to go with the integrated set up. I have never used the hybrid design. It does solve the sprocket wear issue but I would like to see the back side of the flange after 1000 miles.
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